Add kubernetes instructions and manifests (#427)

* add kubernetes instructions

* minor wording improvements

* better password instructions

* add information about changed port

* improved grammar

* Separate docker and k8s docs

Add k8s folder for kubernetes configs

1 files changed, 90 insertions, 0 deletions

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+## Docker
+
+There is a supplied docker image to make deploying a server as a container easier.
+
+```sh
+docker run -d -v "$USER/.config/atuin:/config" ghcr.io/ellie/atuin:latest server start
+```
+
+## Docker Compose
+
+Using the already build docker image hosting your own Atuin can be done using the supplied docker-compose file.
+
+Create a `.env` file next to `docker-compose.yml` with contents like this:
+
+```
+ATUIN_DB_USERNAME=atuin
+# Choose your own secure password
+ATUIN_DB_PASSWORD=really-insecure
+```
+
+Create a `docker-compose.yml`:
+
+```yaml
+version: '3.5'
+services:
+  atuin:
+    restart: always
+    image: ghcr.io/ellie/atuin:main
+    command: server start
+    volumes:
+      - "./config:/config"
+    links:
+      - postgresql:db
+    ports:
+      - 8888:8888
+    environment:
+      ATUIN_HOST: "0.0.0.0"
+      ATUIN_OPEN_REGISTRATION: "true"
+      ATUIN_DB_URI: postgres://$ATUIN_DB_USERNAME:$ATUIN_DB_PASSWORD@db/atuin
+  postgresql:
+    image: postgres:14
+    restart: unless-stopped
+    volumes: # Don't remove permanent storage for index database files!
+      - "./database:/var/lib/postgresql/data/"
+    environment:
+      POSTGRES_USER: $ATUIN_DB_USERNAME
+      POSTGRES_PASSWORD: $ATUIN_DB_PASSWORD
+      POSTGRES_DB: atuin
+```
+
+Start the services using `docker-compose`:
+
+```sh
+docker-compose up -d
+```
+
+### Using systemd to manage your atuin server
+
+The following `systemd` unit file to manage your `docker-compose` managed service:
+
+```
+[Unit]
+Description=Docker Compose Atuin Service
+Requires=docker.service
+After=docker.service
+
+[Service]
+# Where the docker-compose file is located
+WorkingDirectory=/srv/atuin-server
+ExecStart=/usr/bin/docker-compose up
+ExecStop=/usr/bin/docker-compose down
+TimeoutStartSec=0
+Restart=on-failure
+StartLimitBurst=3
+
+[Install]
+WantedBy=multi-user.target
+```
+
+Start and enable the service with:
+
+```sh
+systemctl enable --now atuin
+```
+
+Check if its running with:
+
+```sh
+systemctl status atuin
+```